Post on 20-Apr-2020
Heavy flavour and quarkonia measurements from LHCb
Jana Crkovskaa
aLos Alamos National Laboratory
RHIC & AGS Annual Users’ MeetingBNL, 04-07 June 2019
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 1 / 23
Introduction
LHCb detector
• fully instrumented in 2 < η < 5
• designed for studies of heavy flavour quarks in pp collisions - excellent vertexing, tracking and PID capability
• but is becoming more of a general purpose detector also measuring pPb and PbPb
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 2 / 23
Introduction
Heavy quark production in nuclear collisions
Charm and beauty quarks are produced in the initial stages of a nuclear collisions→ they experience the whole evolutionof the system.
• In A-A heavy quarks measurements serve to characterise the produced hot and dense QCD matter - the QuarkGluon Plasma (QGP).
• In p-A they serve as a clean probe of the Cold Nuclear Matter (CNM) effects.• Modification of nuclear parton distribution functions (nPDFs), gluon saturation, initial state/final state radiation,
coherent energy loss.• CNM are also present in A-A collisions - good understanding of CNM is also vital for correct interpretation of AA
results and characterising the QGP.
• Other thing to study in pA and/or AA are nucleon structure, intrinsic charm content of a nucleon, dark mattersearches . . .
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 3 / 23
Introduction
Recent heavy ion results from LHCb
Heavy flavour production in pPb
• Measurement of B+, B0 and Λ0b production in pPb collisions at
√sNN = 8.16 TeV, PRD 99 (2019) 052011
• Study of Υ production in pPb collisions at√
sNN = 8.16 TeV, JHEP 11 (2018) 194
• Prompt Λ+c production in pPb collisions at
√sNN = 5.02 TeV, JHEP 02 (2019) 102
• Study of prompt D0 meson production in pPb collisions at√
sNN = 5.02 TeV, JHEP 10 (2017) 090
• Prompt and nonprompt J/ψ production and nuclear modification in pPb collisions at√
sNN = 8.16 TeV, PLB 774(2017) 159
Fixed target measurements
• First measurement of charm production in fixed-target configuration at the LHC, PRL 122 (2019) 132002
• Measurement of antiproton production in pHe collisions at√
sNN = 110 GeV, PRL 121 (2018) 222001
Ultra-peripheral PbPb collisions
• Study of coherent J/ψ production in lead-lead collisions at√
sNN = 5.02 TeV with the LHCb experiment,LHCb-CONF-2018-003
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 4 / 23
pPb measurements
pPb measurements
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 4 / 23
pPb measurements
pPb collisions in LHCb
• pPb and Pbp are asymmetric systems→ centre-of-mass rapidity shift by ∆y =±0.465
1.5 < y∗ < 4.0 ⇒ xPb ∼ 10−6
√sNN = 5.02 TeV with 1.1 nb−1
√sNN = 8.16 TeV with 13.6 nb−1
−5.0 < y∗ <−2.5 ⇒ xPb ∼ 10−2
√sNN = 5.02 TeV with 0.5 nb−1
√sNN = 8.16 TeV with 20.8 nb−1
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 5 / 23
pPb measurements
Cold nuclear matter effects in theory
Modifications of nuclear PDFs
• Gluon shadowing/antishadowing: Parton distribution functions are modified by the nuclear environment⇒suppression or enhancement of HF hadrons as a function of the parton momentum fraction x in the nucleon.• HELAC-Onia: H.-S. Shao, Comp. Phys. Comm. 198 (2016) 238.• FONLL: M. Cacciari et al., JHEP 05 (1998) 007.
• Gluon saturation: Result of gluon recombination at small x at the LHC⇒ suppression of HF hadrons.• Colour Glass Condensate (CGC): B. Ducloue et al., PRD 94 (2016) 074031.
Coherent energy loss
• The medium induced gluon radiation in initial and/or final state modifies the HF hadron yields.• F. Arleo, S. Peigne, JHEP 03 (2013) 122.
Dissociation with comovers
• Interaction of HF hadrons with the comoving matter breaks the bound states⇒ suppression.• E. G. Ferreiro, PLB 731 (2014) 57; E. G. Ferreiro and J. P. Lansberg, JHEP 1810 (2018) 094.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 6 / 23
pPb measurements
J/ψ production in pPb at√
sNN = 8.16 TeV
• J/ψ → µ+µ−
• Separated prompt and non-prompt.
• Nuclear modification factor
RpPb(pT,y) =1
208d2
σpPb/dpTdy
d2σpp/dpTdy
−5.0 −2.5 0.0 2.5 5.0y∗
0.0
0.5
1.0
1.5
2.0
RpP
b
0< pT < 14GeV/c
LHCb
prompt J/ψ
HELAC−Onia with EPS09LOHELAC−Onia with nCTEQ15HELAC−Onia with EPS09NLOEnergy LossCGCLHCb (5TeV)LHCb (8.16TeV)
−5.0 −2.5 0.0 2.5 5.0y∗
0.0
0.5
1.0
1.5
2.0
RpP
b
0< pT < 14GeV/c
LHCb
J/ψ -from-b-hadrons
FONLL with EPS09NLOLHCb (5TeV)LHCb (8.16TeV)
• Strong suppression of prompt J/ψ at forward rapidity, non-prompt consistent with unity.
• Suppression pattern described by calculations including modificatons of nPDFs and coherent energy loss.
• No evidence of energy dependence for CNM effects at LHC energy scales.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 7 / 23
PLB 774 (2017) 159
pPb measurements
Prompt Λ+c production in pPb at
√sNN = 5.02 TeV
]c [GeV/T
p2 4 6 8 10
FBR
0
0.5
1
EPS09LOEPS09NLO
nCTEQ15
data
=5 TeVNNsPb pLHCb
c 7.0 GeV/≥ T
p*| < 3.5 y2.5 < |
c < 7.0 GeV/T
p*| < 4.0 y2.5 < |
(a)
*|y|2.5 3 3.5 4
FBR
0
0.5
1
EPS09LOEPS09NLO
nCTEQ15
data
=5 TeVNNsPb pLHCb
c < 10.0 GeV/T
p2.0 <
(b)
• Λ+c measured down to low pT from Λ+
c −→ pK−π+.
• Forward-to-backward ratio studies difference in CNM effects between forward and backward rapidity.
• Larger production rate in backward region reproduced in HELAC-Onia.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 8 / 23
JHEP 02 (2019) 102
pPb measurements
Prompt Λ+c production in pPb at
√sNN = 5.02 TeV (cont.)
• Light and strange hadrons show increase inbaryon-to-meson ratio in central A-A collisions⇒consistent with hadronisation via coalescence.
• Recent measurements show the same behaviour forcharmed hadrons.
• Baryon-to-meson ratio consistent at low pT with theorycalculations based on pp data but are overestimated athigh pT.
]c [GeV/T
p2 4 6 8 10
0D/
+ cΛ
R
0
0.2
0.4
0.6
EPS09LOEPS09NLOnCTEQ15data
LHCb* < 4.0y1.5 <
=5 TeVNNsPb p
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 9 / 23
JHEP 02 (2019) 102
pPb measurements
Open beauty hadron production in pPb at√
sNN = 8.16 TeV
• First measurement of B+, B0, and Λ0b down to low pT in nuclear collisions.
• Clear signal reconstructed from exclusive decays.
5000 5200 5400 5600
]2c) [MeV/+π0D(m
050
100150200250300350400450500)2 c
Can
dida
tes
/ (10
MeV
/
Data
Fit
Signal
Partial
Combinatorial+K
0D→+B
LHCb = 8.16 TeVNNs
Pbp
5000 5200 5400 5600]2c) [MeV/+π−D(m
0
50
100
150
200
250
)2 cC
andi
date
s / (
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eV/
Data
Fit
Signal
Partial
Combinatorial+K−D→0B
LHCb = 8.16 TeVNNs
Pbp
5400 5600 5800]2c) [MeV/−π+
cΛ(m
0
20
40
60
80
100
120)2 cC
andi
date
s / (
10 M
eV/
Data
Fit
Signal
Partial
Combinatorial−K+
cΛ→b0Λ
LHCb = 8.16 TeVNNs
Pbp
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 10 / 23
PRD 99 (2019) 052011
pPb measurements
Open beauty hadron production in pPb at√
sNN = 8.16 TeV (cont.)• Suppression pattern consistent with J/ψ-from-b.• Baryon-to-meson ratio consistent with the pp result.
4− 2− 0 2 4y
00.20.40.60.8
11.21.41.61.8
2
+B
Pbp
R
LHCb pPb/Pbp
= 8.16 TeVNNs
c < 20 GeV/T
p2 <
DataEPPS16nCTEQ15EPPS16*
ψ/JNonprompt
0 5 10 15 20]c [GeV/
Tp
00.20.40.60.8
11.21.41.61.8
2
+B
Pbp
R
LHCb Pbp
= 8.16 TeVNNs
< 3.5y2.5 <
DataEPPS16nCTEQ15EPPS16*
ψ/JNonprompt
0 5 10 15 20]c [GeV/
Tp
00.20.40.60.8
11.21.41.61.8
2
+B
Pbp
R
LHCb pPb
= 8.16 TeVNNs
2.5− < y3.5 < −
DataEPPS16nCTEQ15EPPS16*
ψ/JNonprompt
0 5 10 15 20]c [GeV/
Tp
0
0.5
1
1.5
2
2.5Tp
/dσdR
LHCb < 3.5yPb, 2.5 < p
= 8.16 TeVNNs
+B/0B0B/0
bΛ
0 5 10 15 20]c [GeV/
Tp
0
0.5
1
1.5
2
2.5Tp
/dσdR
LHCb 2.5− < y3.5 < −, pPb
= 8.16 TeVNNs
+B/0B0B/0
bΛ
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 11 / 23
PRD 99 (2019) 052011
pPb measurements
Open beauty hadron production in pPb at√
sNN = 8.16 TeV (cont.)
5 10 15 20]c [GeV/
Tp
00.20.40.60.8
11.21.41.61.8
2
FBR
| < 3.5y2.5 < |
+B0B
b0Λ
pPb/Pbp LHCb = 8.16 TeVNNs
0 1 2 3 4y
00.20.40.60.8
11.21.41.61.8
2
FBR
+B0B
b0Λ
pPb/Pbp LHCb = 8.16 TeVNNs
c < 20 GeV/T
p2 <
0 5 10 15 20]c [GeV/
Tp
00.20.40.60.8
11.21.41.61.8
20B/ b0
Λ Pbp
R
PbppPb
LHCb
= 8.16 TeVNNs
| < 3.5y2.5 < |
4− 2− 0 2 4y
00.20.40.60.8
11.21.41.61.8
20B/ b0
Λ Pbp
R
c < 20 GeV/T
p2 <
LHCb = 8.16 TeVNNs
• Forward-to-backward ratios show the samesuppression in both pPb and Pbp for all threespecies.
• Ratio of Λ0b/B0 modification factors allows to study
the difference in overall CNM effects relevant forthe two species.
Hints of deviation from unity in pT, however moredata required to make strong conclusions.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 12 / 23
PRD 99 (2019) 052011
pPb measurements
Υ production in pPb at√
sNN = 8.16 TeV
9 10 11
310×
]2c) [GeV/−µ+µ(M
0
100
200
300
400
500
600
)2 cC
andi
date
s / (
20 M
eV/ LHCb Pbp=8.16 TeV, NNs
)nS(ϒBackgroundTotal
9 10 11
310×
]2c) [GeV/−µ+µ(M
0
100
200
300
400
500
600
700
800
)2 cC
andi
date
s / (
20 M
eV/ LHCb p=8.16 TeV, PbNNs
)nS(ϒBackgroundTotal
• LHCb measured Υ(nS)→ µ+µ−.
• The three states are clearly separated in both rapidity regions.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 13 / 23
JHEP 11 (2018) 194
pPb measurements
Υ production in pPb at√
sNN = 8.16 TeV (cont.)
4− 2− 0 2 4y*
00.20.40.60.8
1
1.21.41.61.8
2)S(1
ϒ Pbp
R
=8.16 TeVNNs
c<25 GeV/T
p
LHCbpPb, Pbp
EPPS16nCTEQ15EPS09LO+comoversnCTEQ15+comovers
4− 2− 0 2 4y*
00.20.40.60.8
1
1.21.41.61.8
2)S(2
ϒ Pbp
R=8.16 TeVNNs
c<25 GeV/T
p
LHCbpPb, Pbp
EPPS16nCTEQ15EPS09LO+comoversnCTEQ15+comovers
4− 2− 0 2 4y*
00.20.40.60.8
1
1.21.41.61.8
2)S(1
ϒ)/S
(3ϒ
pp)/
pPb
|Pb
p(ℜ
=8.16 TeVNNs
c<25 GeV/T
p
LHCb LHCb
comovers
• Υ(nS) suppression is consistent with models and previous measurements.
• Υ(3S) shows stronger suppression in the backward region than Υ(1S) and Υ(2S).
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 14 / 23
JHEP 11 (2018) 194
pPb measurements
Υ production in pPb at√
sNN = 8.16 TeV (cont.)
• Cross-section ratio of Υ(1S)/J/ψ-from-b comparedbetween measurement in pp and pPb.
• Different hadronisation of close and open beauty⇒different sensitivity to final state CNM effects.
Hionts of different final CNM effects at forward rapidity.
4− 2− 0 2 4y*
00.020.040.060.08
0.10.120.140.160.180.2)b
fro
m
ψJ/(σ
))/
S(1
ϒ(σ c<25 GeV/T
p
LHCb 8.16 TeVpPb, Pbp
8 TeVpp
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 15 / 23
Υ: JHEP 11 (2018) 194J/ψ: PLB 774 (2017) 159
pPb measurements
Fixed target results
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 15 / 23
Fixed target results
p-Gas collisions in LHCb
System for Measuring Overlap with Gas (SMOG)
• Originally conceived to perform precise luminosity measurements(2014 JINST 9 P12005).
• Gas target created by injecting noble gases Ne, Ar, He at pressure oforder 10−6−10−7 mbar into the VELO.
• Energies cover the gap between SPS and RHIC.
• Collisions with protons, newly in 2018 also with Pb!
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 16 / 23
Fixed target results
Charm production in fixed target
• First J/ψ and D0 measurements in pHe at√
sNN = 86.6 GeV and pAr at√
sNN = 110.4 GeV.
• J/ψ and cc integrated cross section extrapolated to full phase-space to allow comparison with other available results
⇒ good agreement with NLO NRQCD (Nucl. Phys. B 373 (1992) 295).
[GeV]NNs210
) [n
b/nu
cleo
n]ψ/J(σ 210
310
This measurement
NLO NRQCD
LHCb
[GeV]NNs10 210 310
b/nu
cleo
n]µ
) [
cc(σ
10
210
310
NLO pQCD
This measurement
LHCb
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 17 / 23
PRL 122 (2019) 132002
Fixed target results
Charm production in fixed target (cont.)
y*2− 1− 0
[nb
/nuc
leon
]y*
/d ψ/
Jσd 100200300400500600700800
LHCb data 1.78 CT14NLO+nCTEQ15×He p
1.78 CT14NLO× ppLinear interpolationLogarithmic interpolation
Hep = 86.6 GeV NNsLHCb
y*2− 1− 0
data
/CT
14N
LO
0.40.60.8
11.21.41.6
]c [GeV/T
p0 2 4 6 8
)]c [
nb/n
ucle
on/(
GeV
/T
p/d
ψ/Jσd
210
310
LHCb data 1.78 CT14NLO+nCTEQ15×He p
1.78 CT14NLO× ppLinear interpolationLogarithmic interpolation
Hep = 86.6 GeV NNsLHCb
]c [GeV/T
p0 2 4 6 8
data
/CT
14N
LO
0.40.60.8
11.21.41.6
y*2− 1−
y*d ψ/
J/N
ψ/J
dN
0.2
0.4
0.6
0.8
1 LHCb dataAr CT14NLO+nCTEQ15p CT14NLOpp
Linear interpolationLogarithmic interpolation
Arp = 110.4 GeV NNsLHCb
y*2− 1−
data
/CT
14N
LO
0.40.60.8
11.21.41.6
]c [GeV/T
p0 2 4 6 8
-1 )c(G
eV/
T
pd ψ/J
/N ψ/J
dN
1−10
1
LHCb dataAr CT14NLO+nCTEQ15p CT14NLOpp
Linear interpolationLogarithmic interpolation
Arp = 110.4 GeV NNsLHCb
]c [GeV/T
p0 2 4 6 8
data
/CT
14N
LO
0.40.60.8
11.21.41.6
• Differential cross-sections comparedwith HELAC-Onia.
• σ(J/ψ) underestimated, rescaledcalculations describe the shape well inpT and y∗.
• Similar conclusion for D0 (plots inbackup).
No evidence of substantial intrinsiccharm content.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 18 / 23
PRL 122 (2019) 132002
Fixed target results
Antiproton production in p-He collisions
LHCb performed the first p measurement in pHe at√
sNN = 110 GeV.
• The p fraction in cosmic rays is a sensitive indirect probe ofdark matter.
• PAMELA and AMS-02 observe an excess in the p/p flux ratiofor high energy cosmic rays.
• The uncertainty on the predictions is limited by thedetermination of the p production cross section in pH and pHecollisions.
• Measurement of p/p ration in pHe will help to improve theaccuracy of future predictions.
arXiv:1504.04276 [astro-ph.HE]
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 19 / 23
PRL 121 (2018) 222001
Fixed target results
Antiproton production in p-He collisions (cont.)
25 30 35 40]c [GeV/p
20406080
100120140160180200220
/GeV
]c
b µ [
p/dσd
LHCb Xp →pHe
= 110 GeVNNs
c < 0.7 GeV/T
p 0.4 <
20 30 40 50]c [GeV/p
20
40
60
80
100
120
140
/GeV
]c
b µ [
p/dσd
LHCb Xp →pHe
= 110 GeVNNs
c < 1.2 GeV/T
p 0.7 <
20 40 60 80 100]c [GeV/p
5
10
15
20
25
30
35
/GeV
]c
b µ [
p/dσd
DATA
EPOS LHC
EPOS 1.99
QGSJETII-04
QGSJETII-04m
HIJING 1.38
PYTHIA 6.4
LHCb Xp →pHe
= 110 GeVNNs
c < 2.8 GeV/T
p 1.2 <
• p momentum distributions in several kinematic bins compared withmultiple predictions:• EPOS LHC PRC92 (2015) 034906• EPOS 1.99 Nucl.Phys.Proc.Suppl. 196 (2009) 102• QGSJETII-04 PRD83 (2011) 014018• QGSJETII-04m Astr. J. 803 (2015) 54• HIJING 1.38 Comp. Phys. Comm. 83 307• PYTHIA 6.4 2(pp+pn) JHEP 05 (2005) 026
• The momentum shapes are well reproduced save for the lowestmomenta.
• Absolute yields on the other hand deviate by up to factor 2.
The relative uncertainty on the data of . 10% is way below thespread from the models.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 20 / 23
PRL 121 (2018) 222001
Measurements in ultra-peripheral PbPb collisions
Ultra-peripheral collisions
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 20 / 23
Measurements in ultra-peripheral PbPb collisions
Coherent J/ψ photoproduction in PbPb at√
sNN = 5.02 TeV
LHCb studied the photoproduction of J/ψ in UPCcollisions
Pb + Pb→ Pb + J/ψ + Pb
• Coherent photoproduction of forward J/ψ in PbPbprobes the gluon nPDFs at low-to-intermediate Bjorken x
2 < y < 4.6 ⇒ 10−5 . xBj . 10−2
• Clean J/ψ signal, hints of ψ(2S).
• The coherent and incoherent photoproduction can bedistinguished from their pT shape:• Signal and backround fit with different STARlight
templates.• Non-resonant component constraint from the invariant
mass fit.
Dimuon mass [MeV]3000 3500 4000
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/ ( 1
3 M
eV )
1−10
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310 LHCb Preliminary = 5 TeVNNsPb-Pb
dataψJ/(2S)ψ
non-resonantsum
10− 5− 0)2/GeV2
Tlog(p
0
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50
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tes
/ 0.1
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LHCb Preliminary = 5 TeVNNsPb-Pb
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 21 / 23
LHCb-CONF-2018-003
Measurements in ultra-peripheral PbPb collisions
Coherent J/ψ photoproduction in PbPb at√
sNN = 5.02 TeV (cont.)
0 1 2 3 4 5y
00.5
11.5
22.5
33.5
44.5
5
/dy
[mb]
σd
Guzey et al.
LTA_W
LTA_S
EPS09
Goncalves et al.
IP-SAT+GLC
IIM+BG
Cepila et al.
GG-hs+BG
GS-hs+BG
ntysaari et al.aM
IS fluct. +GLC
no fluct. +GLC
=5 TeVNNsPb-Pb
LHCb Preliminary
Results for coherent cross section were compared withmultiple phenomenological models - several reproduce therapidity dependence.
• Guzey et al.: PRC 93 (2016) 055206
• Goncalves et al.: PRC 84 (2011) 011902, PRD 96(2017) 094027
• Cepila et al.: PRC 97 (2018) 024901
• Mantysaari et al.: PLB 772 (2017) 832-838
2018 PbPb data 20× more statistics than in 2015⇒more precise measurements in the future!
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 22 / 23
LHCb-CONF-2018-003
Summary
Summary
LHCb has an extensive heavy ion physics programme with some unique measurements.
• Measurements in pPb in collider mode provide new data to constrain CNM and hadronisation in nuclear medium.• Open and close HF RFB, RpPb, baryon-to-meson ratios,. . .
• Measurements in fixed target mode to fill the energy gap between SPS and RHIC.• At present uncertainty found no evidence of intrinsic charm content.• Results on p production will help improve models for dark matter searches.
• New results on coherent photoproduction are reproduced in models.• 2018 statistics 20× the one in 2015 expected to provide more conclusive data.
And the future?
• More precise results to come from Run 2 data: more quarkonia states, vector bosons, dihadron correlations, flowmeasurements. . .
• Higher statistics pNe and PbPb data from Run 2 are being analysed, also new PbNe datasample.
• Upgrade of LHCb detector for Run 3 also includes SMOG2 - higher pressure under more precise control, more gasspecies.
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 23 / 23
Back-up
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 1 / 3
Charm production in fixed target - D0
y*2− 1− 0
b/nu
cleo
n]µ [
y* /d 0
Dσd 1020304050607080
LHCb data 1.44 CT14NLO+nCTEQ15×He p
1.44 CT14NLO× pp
Hep = 86.6 GeV NNsLHCb
y*2− 1− 0
data
/CT
14N
LO
0.40.60.8
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]c [GeV/T
p0 2 4 6 8
)]cb/
nucl
eon/
(GeV
/µ [
Tp
/d 0Dσd 1−10
1
10
210 LHCb data 1.44 CT14NLO+nCTEQ15×He p
1.44 CT14NLO× pp
Hep = 86.6 GeV NNsLHCb
]c [GeV/T
p0 2 4 6 8
data
/CT
14N
LO
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1.52
2.5
y*2− 1− 0
y*d 0D
/N 0D
dN
0.2
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y*2− 1− 0
data
/CT
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LO
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]c [GeV/T
p0 2 4 6 8
-1 )c(G
eV/
T
pd 0D
/N 0D
dN
2−10
1−10
1LHCb data
Ar CT14NLO+nCTEQ15p CT14NLOpp
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]c [GeV/T
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data
/CT
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0.51
1.52
2.5
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 2 / 3
Open beauty hadron production in pPb at√
sNN = 8.16 TeV
• First measurement of B+, B0, and Λ0b down to low pT in nuclear collisions.
• Baryon-to-meson ratio consistent with the pp result.
4− 2− 0 2 4y
00.20.40.60.8
11.21.41.61.8
2y/dσd
R
+B/0B0B/b
0Λ
+B/0B0B/b
0Λ c < 20 GeV/T
p2 <
LHCb = 8.16 TeVNNs
pPb/Pbp
0 5 10 15 20]c [GeV/
Tp
0
0.5
1
1.5
2
2.5Tp
/dσdR
LHCb < 3.5yPb, 2.5 < p
= 8.16 TeVNNs
+B/0B0B/0
bΛ
0 5 10 15 20]c [GeV/
Tp
0
0.5
1
1.5
2
2.5Tp
/dσdR
LHCb 2.5− < y3.5 < −, pPb
= 8.16 TeVNNs
+B/0B0B/0
bΛ
jana.crkovska@cern.ch 2019RHIC/AGS 04/06/2019 3 / 3
PRD 99 (2019) 052011